A PO BOX number can be less than or more than four digit. For post office boxes, the general rule is that each box has its own ZIP+4 code.
The last four digit is often one of the following:
1. Zero plus the last three digits of the box number (eg. PO BOX 1001, Los Angeles CA 90001-0001).
2. The last four digits of the box number (eg. PO BOX 9991, Twin Peaks CA 92391-9991).
3. If the box number is less than four digits, enough zeros prepended to the front of the box number to produce a four-digit number(eg. PO BOX 1, Shreveport LA 71161-0001).
However, there is no uniform rule, the zip code plus four is for reference only, the ZIP+4 code must be looked up individually for each box in the USPS offical website.
PO BOX 101, CHARLOTTE, IA 52731-0101
PO BOX 102, CHARLOTTE, IA 52731-0102
PO BOX 103, CHARLOTTE, IA 52731-0103
PO BOX 104, CHARLOTTE, IA 52731-0104
PO BOX 105, CHARLOTTE, IA 52731-0105
PO BOX 106, CHARLOTTE, IA 52731-0106
PO BOX 107, CHARLOTTE, IA 52731-0107
PO BOX 108, CHARLOTTE, IA 52731-0108
PO BOX 109, CHARLOTTE, IA 52731-0109
PO BOX 110, CHARLOTTE, IA 52731-0110
PO BOX 111, CHARLOTTE, IA 52731-0111
PO BOX 112, CHARLOTTE, IA 52731-0112
PO BOX 113, CHARLOTTE, IA 52731-0113
PO BOX 114, CHARLOTTE, IA 52731-0114
PO BOX 115, CHARLOTTE, IA 52731-0115
PO BOX 116, CHARLOTTE, IA 52731-0116
PO BOX 117, CHARLOTTE, IA 52731-0117
PO BOX 118, CHARLOTTE, IA 52731-0118
PO BOX 119, CHARLOTTE, IA 52731-0119
PO BOX 120, CHARLOTTE, IA 52731-0120
PO BOX 121, CHARLOTTE, IA 52731-0121
PO BOX 122, CHARLOTTE, IA 52731-0122
PO BOX 123, CHARLOTTE, IA 52731-0123
PO BOX 124, CHARLOTTE, IA 52731-0124
PO BOX 125, CHARLOTTE, IA 52731-0125
PO BOX 126, CHARLOTTE, IA 52731-0126
PO BOX 127, CHARLOTTE, IA 52731-0127
PO BOX 128, CHARLOTTE, IA 52731-0128
PO BOX 129, CHARLOTTE, IA 52731-0129
PO BOX 130, CHARLOTTE, IA 52731-0130
PO BOX 131, CHARLOTTE, IA 52731-0131
PO BOX 132, CHARLOTTE, IA 52731-0132
PO BOX 133, CHARLOTTE, IA 52731-0133
PO BOX 134, CHARLOTTE, IA 52731-0134
PO BOX 135, CHARLOTTE, IA 52731-0135
PO BOX 136, CHARLOTTE, IA 52731-0136
PO BOX 137, CHARLOTTE, IA 52731-0137
PO BOX 138, CHARLOTTE, IA 52731-0138
PO BOX 139, CHARLOTTE, IA 52731-0139
PO BOX 140, CHARLOTTE, IA 52731-0140
PO BOX 141, CHARLOTTE, IA 52731-0141
PO BOX 142, CHARLOTTE, IA 52731-0142
PO BOX 143, CHARLOTTE, IA 52731-0143
PO BOX 144, CHARLOTTE, IA 52731-0144
PO BOX 145, CHARLOTTE, IA 52731-0145
PO BOX 146, CHARLOTTE, IA 52731-0146
PO BOX 147, CHARLOTTE, IA 52731-0147
PO BOX 148, CHARLOTTE, IA 52731-0148
PO BOX 149, CHARLOTTE, IA 52731-0149
PO BOX 150, CHARLOTTE, IA 52731-0150
PO BOX 151, CHARLOTTE, IA 52731-0151
PO BOX 152, CHARLOTTE, IA 52731-0152
PO BOX 153, CHARLOTTE, IA 52731-0153
PO BOX 154, CHARLOTTE, IA 52731-0154
PO BOX 155, CHARLOTTE, IA 52731-0155
PO BOX 156, CHARLOTTE, IA 52731-0156
PO BOX 157, CHARLOTTE, IA 52731-0157
PO BOX 158, CHARLOTTE, IA 52731-0158
PO BOX 159, CHARLOTTE, IA 52731-0159
PO BOX 160, CHARLOTTE, IA 52731-0160
PO BOX 161, CHARLOTTE, IA 52731-0161
PO BOX 162, CHARLOTTE, IA 52731-0162
PO BOX 163, CHARLOTTE, IA 52731-0163
PO BOX 164, CHARLOTTE, IA 52731-0164
PO BOX 165, CHARLOTTE, IA 52731-0165
PO BOX 166, CHARLOTTE, IA 52731-0166
PO BOX 167, CHARLOTTE, IA 52731-0167
PO BOX 168, CHARLOTTE, IA 52731-0168
PO BOX 169, CHARLOTTE, IA 52731-0169
PO BOX 170, CHARLOTTE, IA 52731-0170
PO BOX 171, CHARLOTTE, IA 52731-0171
PO BOX 172, CHARLOTTE, IA 52731-0172
PO BOX 173, CHARLOTTE, IA 52731-0173
PO BOX 174, CHARLOTTE, IA 52731-0174
PO BOX 175, CHARLOTTE, IA 52731-0175
PO BOX 176, CHARLOTTE, IA 52731-0176
PO BOX 177, CHARLOTTE, IA 52731-0177
PO BOX 178, CHARLOTTE, IA 52731-0178
PO BOX 179, CHARLOTTE, IA 52731-0179
PO BOX 180, CHARLOTTE, IA 52731-0180
PO BOX 181, CHARLOTTE, IA 52731-0181
PO BOX 182, CHARLOTTE, IA 52731-0182
PO BOX 183, CHARLOTTE, IA 52731-0183
PO BOX 184, CHARLOTTE, IA 52731-0184
PO BOX 185, CHARLOTTE, IA 52731-0185
PO BOX 186, CHARLOTTE, IA 52731-0186
PO BOX 187, CHARLOTTE, IA 52731-0187
PO BOX 188, CHARLOTTE, IA 52731-0188
PO BOX 189, CHARLOTTE, IA 52731-0189
PO BOX 190, CHARLOTTE, IA 52731-0190
PO BOX 191, CHARLOTTE, IA 52731-0191
PO BOX 192, CHARLOTTE, IA 52731-0192
PO BOX 193, CHARLOTTE, IA 52731-0193
PO BOX 194, CHARLOTTE, IA 52731-0194
PO BOX 195, CHARLOTTE, IA 52731-0195
PO BOX 196, CHARLOTTE, IA 52731-0196
PO BOX 197, CHARLOTTE, IA 52731-0197
PO BOX 198, CHARLOTTE, IA 52731-0198
PO BOX 199, CHARLOTTE, IA 52731-0199
PO BOX 200, CHARLOTTE, IA 52731-0200
PO BOX 201, CHARLOTTE, IA 52731-0201
PO BOX 202, CHARLOTTE, IA 52731-0202
PO BOX 203, CHARLOTTE, IA 52731-0203
PO BOX 204, CHARLOTTE, IA 52731-0204
PO BOX 205, CHARLOTTE, IA 52731-0205
PO BOX 206, CHARLOTTE, IA 52731-0206
PO BOX 207, CHARLOTTE, IA 52731-0207
PO BOX 208, CHARLOTTE, IA 52731-0208
PO BOX 209, CHARLOTTE, IA 52731-0209
PO BOX 210, CHARLOTTE, IA 52731-0210
PO BOX 211, CHARLOTTE, IA 52731-0211
PO BOX 212, CHARLOTTE, IA 52731-0212
PO BOX 213, CHARLOTTE, IA 52731-0213
PO BOX 214, CHARLOTTE, IA 52731-0214
PO BOX 215, CHARLOTTE, IA 52731-0215
PO BOX 216, CHARLOTTE, IA 52731-0216
PO BOX 217, CHARLOTTE, IA 52731-0217
PO BOX 218, CHARLOTTE, IA 52731-0218
PO BOX 219, CHARLOTTE, IA 52731-0219
PO BOX 220, CHARLOTTE, IA 52731-0220
PO BOX 221, CHARLOTTE, IA 52731-0221
PO BOX 222, CHARLOTTE, IA 52731-0222
PO BOX 223, CHARLOTTE, IA 52731-0223
PO BOX 224, CHARLOTTE, IA 52731-0224
PO BOX 225, CHARLOTTE, IA 52731-0225
PO BOX 226, CHARLOTTE, IA 52731-0226
PO BOX 227, CHARLOTTE, IA 52731-0227
PO BOX 228, CHARLOTTE, IA 52731-0228
PO BOX 229, CHARLOTTE, IA 52731-0229
PO BOX 230, CHARLOTTE, IA 52731-0230
PO BOX 231, CHARLOTTE, IA 52731-0231
PO BOX 232, CHARLOTTE, IA 52731-0232
PO BOX 233, CHARLOTTE, IA 52731-0233
PO BOX 234, CHARLOTTE, IA 52731-0234
PO BOX 235, CHARLOTTE, IA 52731-0235
PO BOX 236, CHARLOTTE, IA 52731-0236
PO BOX 237, CHARLOTTE, IA 52731-0237
PO BOX 238, CHARLOTTE, IA 52731-0238
PO BOX 239, CHARLOTTE, IA 52731-0239
PO BOX 240, CHARLOTTE, IA 52731-0240
PO BOX 241, CHARLOTTE, IA 52731-0241
PO BOX 242, CHARLOTTE, IA 52731-0242
PO BOX 243, CHARLOTTE, IA 52731-0243
PO BOX 244, CHARLOTTE, IA 52731-0244
PO BOX 245, CHARLOTTE, IA 52731-0245
PO BOX 246, CHARLOTTE, IA 52731-0246
PO BOX 247, CHARLOTTE, IA 52731-0247
PO BOX 248, CHARLOTTE, IA 52731-0248
PO BOX 249, CHARLOTTE, IA 52731-0249
PO BOX 250, CHARLOTTE, IA 52731-0250
PO BOX 251, CHARLOTTE, IA 52731-0251
PO BOX 252, CHARLOTTE, IA 52731-0252
PO BOX 253, CHARLOTTE, IA 52731-0253
PO BOX 254, CHARLOTTE, IA 52731-0254
PO BOX 255, CHARLOTTE, IA 52731-0255
PO BOX 256, CHARLOTTE, IA 52731-0256
PO BOX 257, CHARLOTTE, IA 52731-0257
PO BOX 258, CHARLOTTE, IA 52731-0258
PO BOX 259, CHARLOTTE, IA 52731-0259
PO BOX 260, CHARLOTTE, IA 52731-0260
PO BOX 261, CHARLOTTE, IA 52731-0261
PO BOX 262, CHARLOTTE, IA 52731-0262
PO BOX 263, CHARLOTTE, IA 52731-0263
PO BOX 264, CHARLOTTE, IA 52731-0264
PO BOX 265, CHARLOTTE, IA 52731-0265
PO BOX 266, CHARLOTTE, IA 52731-0266
PO BOX 267, CHARLOTTE, IA 52731-0267
PO BOX 268, CHARLOTTE, IA 52731-0268
PO BOX 269, CHARLOTTE, IA 52731-0269
PO BOX 270, CHARLOTTE, IA 52731-0270
PO BOX 271, CHARLOTTE, IA 52731-0271
PO BOX 272, CHARLOTTE, IA 52731-0272
PO BOX 273, CHARLOTTE, IA 52731-0273
PO BOX 274, CHARLOTTE, IA 52731-0274
PO BOX 275, CHARLOTTE, IA 52731-0275
PO BOX 276, CHARLOTTE, IA 52731-0276
PO BOX 277, CHARLOTTE, IA 52731-0277
PO BOX 278, CHARLOTTE, IA 52731-0278
PO BOX 279, CHARLOTTE, IA 52731-0279
PO BOX 280, CHARLOTTE, IA 52731-0280
PO BOX 281, CHARLOTTE, IA 52731-0281
PO BOX 282, CHARLOTTE, IA 52731-0282
PO BOX 283, CHARLOTTE, IA 52731-0283
PO BOX 284, CHARLOTTE, IA 52731-0284
PO BOX 285, CHARLOTTE, IA 52731-0285
PO BOX 286, CHARLOTTE, IA 52731-0286
PO BOX 287, CHARLOTTE, IA 52731-0287
PO BOX 288, CHARLOTTE, IA 52731-0288
PO BOX 289, CHARLOTTE, IA 52731-0289
PO BOX 290, CHARLOTTE, IA 52731-0290
PO BOX 291, CHARLOTTE, IA 52731-0291
PO BOX 292, CHARLOTTE, IA 52731-0292
PO BOX 293, CHARLOTTE, IA 52731-0293
PO BOX 294, CHARLOTTE, IA 52731-0294
PO BOX 295, CHARLOTTE, IA 52731-0295
PO BOX 296, CHARLOTTE, IA 52731-0296
PO BOX 297, CHARLOTTE, IA 52731-0297
PO BOX 298, CHARLOTTE, IA 52731-0298
PO BOX 299, CHARLOTTE, IA 52731-0299
PO BOX 300, CHARLOTTE, IA 52731-0300
PO BOX 301, CHARLOTTE, IA 52731-0301
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